Wilson Tennis on Twitter: "Stiffness: How much the racket frame flexes on contact Less Stiff=More Control More Stiff=More Power We measure Stiffness using the Stiffness Index (SI) Test. The more the racket
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Melbourne, Australia, 2015, May 9: String bed stiffness of a Tennis tour player frame is measured on strings. The measurement is used to check the qua Stock Photo - Alamy
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